Casting device



J. F. McMATH.

CASTING DEVICE.

APPLICATION FILED N31, 1917.

1, 352, 523, v Patented Sept. 14, 1920.

F57 010 i 6 J5 J6 J8 JO- ad r AM Mg/35 UNITED STATES JOHN F. MCMATH, 0F OAKLAND, CALIFORNIA.

CASTING DEVICE.

Specification of Letters I'atent.

Patented Sept. 14, 1920.

Application filed January 31, 1917. Serial No. 145,723.

To all whom it may concern:

Be it known that I, JOHN F. MOMATH,

citizen of the United States, residing at Oakland, in the county of Alameda and State of California, have invented certain new and useful Improvements in Casting Devices, of which the following is a specification.

This invention is an improved centrifugal casting device particularly adapted for use in dentistry for casting fillings for teeth, dentures, bridgework, etc.

The invention is illustrated in the accompanying drawing which forms part of this specification and the appended claims.

Referring to the drawing:

Figure 1 is a front elevation partly in section of .the device.

Fig. 2 is a side elevation thereof.

Fig. 3 is a plan view of the mold carrier.

Numeral 1 indicates a base upon which a frame 2 is mounted in which frame is mounted an electric motor 3. A bearing 4 is mounted above the top of the frame on arms 5 extending upwardly from the frame, in which bearing is journaled a shaft 6. On one end of said shaft is mounted a pulley 7 in alinement with pulley 8 on the motor shaft 9. A belt 10 extends over the pulleys 8 and 7, whereby the shaft 6 is driven by the motor 3. The other end of the shaft 6 is provided with a hole 12 extending transversely therethrough, through which extends rod 13 of mold carrying element 15.

A set screw 16 screws into the end of the shaft 6 against the rod 13 and holds the rod and mold carrying element 15 in proper position on said shaft. A look nut 17 screws on set screw 16' against the end of the shaft and locks the set screw in engagement with the v i 20 and mold 25, whereupon centrifugal force rod 13 whereby the. mold carrying element is locked in the desired position on the shaft. One end of the rod 13 is forked providing a pair of arms 18. A mold carrier 20 is pivoted to the arms 18 of the mold carrying element by means iof' screwv pivots 21 extending through the side members 22 of the carrier and screwing into the ends of arms 18. The wall 23 of the carrier is provided with an opening 24 adapted to receive .a mold 25. The mold comprises a retainer 26 having a flange 27 which engages the inner side of the carrier wall 23 to sustain the mold in the carrier. The retainer 26 holds the mold body 30 having the impression 31 of the article to be molded, such as a tooth filling as shown.

'A counterweight 35 is slidably mounted on the rod 13 on the side of the shaft 6 opposite the side on which the carrier is located, which weight may be adjustably secured to the rod by set screw 36. A nut 37 screws on the end of the rod 13 opposite the carrier to prevent the weight sliding off the rod in case the'set screw should become loose. A

spring clip 40 fits over the carrier wall 23, on which clip are arms 11 adapted to engage moldcasing flange 27 to prevent'the mold from dropping inwardly out of'the carrier if the mold should tend to drop from the carrier in this manner. The clip may be moved to one side to disengage the arms 41 from the flange 27 so thatthe mold may be removed from the carrier.

The operation of'the invention is as follows:

The impression 31 of the article such as a tooth, is made in the body 30 of the mold and the space confined by said impression is filled with the metal such as gold, or with other material of which the article is to be molded. The mold is then inserted through the opening 24 in carrier wall 23, so that the retainer flange 27, rests upon the inside of the carrier wall. The flange holds the mold within the carrier so that it cannot fall outwardly from the carrier by gravity or by centrifugal force. The clip 40 is then shift- I shaft pulley 7. The shaft 6 as'it is rotated,

rotates the mold carrying element 15, carrier causes the carrier 20 to turn on its pivot 21 so that the bottom of the mold impression 31 will extend outwardly radially from the shaft 6, and said force packs the gold or other material compactly in the mold impression and thereby molds the tooth filling or other article to'the exact configuration of the mold impression. The counterweight 35 is adjusted and secured on the rod 13 by set screw 36 in such position as to counterbalance the carrier 20 and mold 25 during rotation of the mold carrying element and said carrier and mold, thus giving uniformity to the centrifugal'packing force on the material in the mold-impression.

By means of the lock nut 17 and screw 16, the rod 13 may be adjusted in the shaft rier. By varying the size of the pulleys 8' and 7 the driving power transmitted from the motor to the shaft 6 and carrier 20 may be varied to meet the requirements of conditions. The relation of the driving power to r the stroke of the carrier is important in that it provides the proper force for driving the material properly into the mold and properliyi molding the article.

aving described my invention I claim as new and desire to secure by Letters Patent:

1. A casting device comprising a suitably journaled shaft, a carrying element comprising a rod extending diametrically through said shaft, a fork on one end of said rod comprising two arms, a carrier comprising a pair of members pivoted to said fork arms and a connecting member connecting said pivoted members for carrying a mold, said carrier being adapted to swing on its pivots so as to cause the bottom of the mold impression to extend outwardly radially as the shaft is rotated.

2. A casting device comprising a suitably journaled shaft, a carrying element comprismg a rod extending diametrically through said shaft, a fork on one end of said rod comprising two arms, a carrier comprising a pair of members pivoted to said fork arms, a connecting member connecting said pivoted members for carrying a mold, said carrier being adapted to swing on its ivots so as to cause the bottom of the mold impression to extend outwardly radially as the shaft is rotated, and a counterweight on said rod for counterbalancing said carrier and the mold carried thereby.

3. A casting devicecomprising a rotatable mold carrier,-means for rotating said carrier, and means whereby the driving power applied to rotate the carrier may be varied.

4. A casting device comprising a rotatable mold carrier, means for rotating said carrier, means whereby the driving power applied to rotate the carrier may be varied, and means for varying the stroke of the carrier.

5. A casting device comprising a shaft suitably journaled, a carrying element comprising a rod, said shaft having a hole extending transversely therethrough through which the rod of said carrying element ada carrier on sa1d carrying justably extends, element, a mold carried by said carrier, and a set screw in said shaft for engaging and securin said rod, carrying element, carrier and mo d in adjusted position with relation to the shaft.

6. A casting device including a shaft suitably journaled, a carrier including a rod secured to said shaft transversely thereof, a mold carried by said carrier, a counterbalancing weight on said rod for said carrier, a set screw for securing said weight to said rod and a nut screwed on the end of said rod.

7. A casting device comprising a shaft suitably journaled, a rod extending transversely of said shaft and secured thereto, a fork on one end of said rod, a carrier com prising a pair of members pivoted respectively to the arms of said fork, and a connecting member connecting said pivoted members and provided with an opening, a mold adapted to fit within said opening, and a flange on said mold for engaging said connecting member to hold the mold in the carner.

In testimony wherjaof I afiix my signature.

OHN F. MoMATH. 

